| Vastar-Duncan "A" G-3-163144 | Magnum Producing, LP only | Egypt (Cook MTN) | Wharton | 1 | 159K | 9.03M | May 1997 – Sep 2004 |
| Duncan G-3-167982 | Faulconer, Vernon E., Inc. only | Egypt, N. (Cook MTN RA) | Wharton | 1 | 125K | 6.61M | Mar 1998 – May 2013 |
| Vastar-Duncan "D" G-3-172021 | Faulconer, Vernon E., Inc. only | Egypt (Cook MTN) | Wharton | 1 | 118K | 10.4M | Jan 1999 – Apr 2016 |
| Duncan G-3-164835 | Faulconer, Vernon E., Inc. only | Egypt, N. (Cook Mtn.) | Wharton | 1 | 107K | 6.97M | Mar 1997 – Jul 2008 |
| Northington G-3-162017 | Home Petroleum Corp. only | Egypt (Cook MTN) | Wharton | 1 | 88.8K | 4.78M | Dec 1996 – Mar 2026 |
| Krenek, Edward et Al G-3-253373 | TMR Exploration, Inc. only | Hungerford, S. (Cook Mountain) | Wharton | 1 | 82.4K | 791K | Jul 2009 – Oct 2015 |
| Schumaker, Alice et Al G-3-130371 | Faulconer Energy, LLC only | McFarlan (Cook Mountain) | Wharton | 1 | 60.4K | 10.9M | Jan 1993 – Apr 2026 |
| Dorotik, Jerome G-3-137752 | Faulconer Energy, LLC only | Ammann, North (Cook Mountain) | Wharton | 1 | 35.4K | 4.16M | Jan 1993 – Apr 2026 |
| Ammann, Homer Trust G-3-131950 | Faulconer Energy, LLC only | McFarlan (Cook Mountain) | Wharton | 1 | 32.6K | 6.26M | Jan 1993 – Apr 2026 |
| Vineyard, Robert S. G-3-128714 | Faulconer Energy, LLC only | McFarlan (Cook Mountain) | Wharton | 1 | 32K | 6.92M | Jan 1993 – Apr 2026 |
| Miller, Ilse G-3-130121 | Faulconer, Vernon E., Inc. only | McFarlan (Cook Mountain) | Wharton | 1 | 30.7K | 6.87M | Jan 1993 – Apr 2009 |
| O.B. Ranch G-3-261255 | Hilcorp Energy Company only | Red Bull (Cook Mountain) | Wharton | 1 | 29.3K | 276K | Dec 2010 – Mar 2017 |
| Schumaker, Gene L. G-3-130538 | Faulconer, Vernon E., Inc. only | Ammann, West (Cook Mountain) | Wharton | 1 | 27.4K | 4.06M | Jan 1993 – Oct 2015 |
| Hancock G-3-170803 | Home Petroleum Corp. only | Egypt (Cook MTN) | Wharton | 1 | 26.7K | 1.62M | Feb 1998 – Mar 2026 |
| Weinheimer G-3-259092 | TMR Exploration, Inc. only | Alwan (Cook Mountain) | Wharton | 1 | 26.2K | 769K | Jul 2010 – Apr 2020 |
| Duncan G-3-168092 | Faulconer, Vernon E., Inc. only | Egypt, N. (Cook MTN RA) | Wharton | 1 | 24.6K | 1.27M | Dec 1997 – Nov 2011 |
| E.A. Weinheimer-Grady Trust Unit G-3-139930 | Crimson Exploration Inc. only | Alwan (Cook Mountain) | Wharton | 1 | 24.1K | 534K | Jun 1993 – Mar 2005 |
| Fucik, David G-3-132847 | Faulconer Energy, LLC only | Ammann, South (Cook Mountain) | Wharton | 1 | 20.7K | 6.03M | Jan 1993 – Apr 2026 |
| Northington-Shwab G-3-298428 | Ricochet Energy, Inc. only | Egypt (Cook MTN) | Wharton | 1 | 19.8K | 931K | Dec 2024 – Apr 2026 |
| Hancock Ranch G-3-174180 | Samson Lone Star LP only | Wharco Shilling (Cook Mountain) | Wharton | 1 | 14.3K | 769K | Jul 1999 – Oct 2001 |
| Schmidt G-3-167086 | Dynamic Production, Inc. only | Egypt (Cook MTN) | Wharton | 1 | 13.6K | 571K | Jan 1998 – Sep 2019 |
| Evangeline G-3-281708 | Transpacific Energy, LLC only | Egypt (Cook MTN) | Wharton | 1 | 13.4K | 1.07M | Apr 2016 – Mar 2026 |
| Evangeline G-3-286175 | Transpacific Energy, LLC only | Egypt (Cook MTN) | Wharton | 1 | 12.7K | 1.27M | Sep 2018 – Mar 2026 |
| Moreland et Al G-3-210789 | Oblaen Resources LLC only | Moreland Ranch (8140 Cook Mtn.) | Wharton | 1 | 10.9K | 1.75M | Mar 2005 – May 2016 |
| Forgason Division, Ltd. G-3-176544 | Walter Oil & Gas Corporation only | Egypt (Cook Mtn. 8300) | Wharton | 1 | 8.99K | 1.38M | Sep 1999 – May 2001 |
| Pryor Trust "B" G-3-182408 | Ascent Operating, LP only | New Taiton (Cook Mtn.) | Wharton | 1 | 8.38K | 1.89M | Mar 2001 – Jan 2004 |
| Rust Estate G-3-229607 | Cico Oil & Gas Company only | Hungerford, S. (Cook Mountain) | Wharton | 1 | 7.42K | 551K | Mar 2007 – Sep 2012 |
| Lichnovsky G-3-199708 | Faulconer Energy, LLC only | Ammann, West (Cook Mountain) | Wharton | 1 | 5.85K | 1.09M | Jun 2003 – Apr 2026 |
| Duncan G-3-171875 | Hilcorp Energy Company only | Egypt, N. (Cook Mtn. RB) | Wharton | 1 | 5.54K | 330K | May 1998 – Feb 2003 |
| Outlar, L. B. Jr. et Al G-3-131638 | Hughes, Dan A. Company only | McFarlan (Cook Mountain) | Wharton | 1 | 4.55K | 545K | Jan 1993 – Sep 2003 |
| Northington G-3-171901 | Hilcorp Energy Company only | Egypt (Upper Cook Mtn.) | Wharton | 1 | 4.14K | 536K | Dec 1998 – Mar 2013 |
| Merta Heirs Unit G-3-287774 | Ricochet Energy, Inc. only | Alwan (Cook Mountain) | Wharton | 1 | 4.07K | 204K | Jun 2019 – Jun 2021 |
| Wynn, John T. G-3-175704 | Great Western Drilling Company only | Egypt (Cook MTN) | Wharton | 1 | 3.6K | 520K | Feb 2000 – Sep 2010 |
| Kieler Heirs G-3-253419 | Choice Exploration, Inc. only | Moreland Ranch (8140 Cook Mtn.) | Wharton | 1 | 3.56K | 279K | Sep 2009 – Dec 2010 |
| O.B. Ranch G-3-265258 | Hilcorp Energy Company only | Red Bull (Cook Mountain) | Wharton | 1 | 2.89K | 255K | Sep 2011 – Sep 2017 |
| Dybala G.U. G-3-255289 | Dallas Petroleum Group, LLC only | Bowmore (Cook Mountain) | Wharton | 1 | 2.19K | 627K | Feb 2010 – Feb 2016 |
| Northington "B" G-3-253402 | Hilcorp Energy Company only | Bernard, W. (Cook Mt. 7800) | Wharton | 1 | 2K | 417K | Aug 2009 – May 2025 |
| Westmoreland Unit G-3-176256 | Apache Corporation only | Bernard, W. (Cook Mt. 7800) | Wharton | 1 | 1.93K | 968K | Dec 1999 – Jan 2008 |
| Northington Unit 3 G-3-286144 | Cico Oil & Gas Company only | Egypt (Cook MTN) | Wharton | 1 | 1.69K | 93.4K | Sep 2017 – Oct 2018 |
| Pierce Ranch O-3-26057 | Hilcorp Energy Company only | Red Bull (Cook Mountain) | Wharton | 1 | 1.28K | 5.33K | Dec 2011 – Aug 2014 |
| Bernard, Hvalinka G-3-218132 | Decker Operating Co., L.L.C. only | Bernard, W. (Cook Mt. 7800) | Wharton | 1 | 1.11K | 332K | Jun 2006 – Sep 2015 |
| Duncan G-3-173652 | Mustang Fuel Corporation only | Egypt (Cook Mtn. 8300) | Wharton | 1 | 966 | 102K | Jun 1999 – Dec 1999 |
| Moreland et al Gas Unit G-3-282913 | Oblaen Resources LLC only | Moreland Ranch (7875 Cook Mtn.) | Wharton | 1 | 901 | 187K | Apr 2017 – Aug 2018 |
| Wilson, G. N. G-3-137116 | Medallion Oil Company only | Jones Creek (Cook Mtn. 8480) | Wharton | 1 | 725 | 164K | Jan 1993 – Oct 1996 |
| Vastar-Duncan "C" G-3-165202 | Walter Oil & Gas Corporation only | Egypt (Cook Mtn. 8300) | Wharton | 1 | 480 | 42.4K | Dec 1997 – Jul 1998 |
| Rust Estate G-3-239700 | Cico Oil & Gas Company only | Hungerford, S. (Cook Mountain) | Wharton | 1 | 305 | 10K | Apr 2008 – May 2008 |
| Duncan C G-3-259461 | XTO Energy Inc. only | Egypt (Upper Cook Mtn.) | Wharton | 1 | 177 | 2.65K | Feb 2008 – Jun 2008 |
| Duncan C G-3-232425 | XTO Energy Inc. only | Egypt (Cook Mtn. 8300) | Wharton | 1 | 110 | 11.4K | Oct 2007 – Jan 2008 |
| Duncan A93 G-3-223399 | Hunt Oil Company only | Alwan (Cook Mountain) | Wharton | 1 | 88 | 57.7K | Aug 2006 – Jun 2008 |
| Hlavinka-Duncan G-3-236459 | Gcer Onshore, LLC only | Egypt (Cook Mtn. 8300) | Wharton | 1 | 70 | 6.25K | Apr 2008 – Mar 2011 |